I'm finished, attached is my latest version.
Key Features:
- Detect (nearly) all Fat16+Fat32-Partitions on your CF-Card, DOM, etc. (1st Partition please). Prefered is Fat32 (should be faster with Save-Commands)
You can format the media with e.g. Windows and fill it with data.
- Partial longnames.
- the usual RSX like |MD, |RD, |REN,....
- |DIR + |CD accepts wildcards
- Compatibility should be high (i hope so

) - but i'm playing around with a lower-rom-patch to increase compatibility.
- Burn to ROM7 is allowed (max. compatibility), with (or without) AMSDOS as ROM8 or 9,10,....
- ROM7 without Floppy-ROM is allowed too, compatible with Duke's lower-ROM-Patch
The ROM must be placed below (if used) AMSDOS, M4DOS, PARADOS
Not compatible with ACMEDOS at the same time.
YANCC-User should be update to the latest version.
History:
Added 23.03.18: CubeIOS180318b - first release - The ROM had fled

but i found it (please reload the file, sorry)
Added 15.04.18: CubeIOS140418b - Bugfixing + flexible ROM configuration allowed, changed handling of |A (see textfile)
Added 30.08.18: FormatBAS - the upcoming next release(s) will no longer include "Format.bas"
Added 01.10.18: CubeMDOS230918b - Renamed ROM, Support of Symbiface 3, HXC+Gotek (see Readme) + Small Bugfixes
Added 04.10.19: CubeMDOS290919b - A lot of Bugfixes